D20842.diff
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	Index: head/sys/vm/vm_pageout.c
	===================================================================
	--- head/sys/vm/vm_pageout.c
	+++ head/sys/vm/vm_pageout.c
	@@ -266,7 +266,7 @@
	vm_pageout_collect_batch(struct scan_state *ss, const bool dequeue)
	{
	struct vm_pagequeue *pq;
	- vm_page_t m, marker;
	+ vm_page_t m, marker, n;

	marker = ss->marker;
	pq = ss->pq;
	@@ -277,7 +277,8 @@
	vm_pagequeue_lock(pq);
	for (m = TAILQ_NEXT(marker, plinks.q); m != NULL &&
	ss->scanned < ss->maxscan && ss->bq.bq_cnt < VM_BATCHQUEUE_SIZE;
	- m = TAILQ_NEXT(m, plinks.q), ss->scanned++) {
	+ m = n, ss->scanned++) {
	+ n = TAILQ_NEXT(m, plinks.q);
	if ((m->flags & PG_MARKER) == 0) {
	KASSERT((m->aflags & PGA_ENQUEUED) != 0,
	("page %p not enqueued", m));